<template>
    <div>
        <!-- 面包屑 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片区域 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <!-- 步骤条 -->
            <el-steps :space="200" :active="parseInt(activeIndex)" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- 表单区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <!-- tab 栏 -->
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClick">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name" placeholder="请输入商品名称"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input type="number" v-model="addForm.goods_price" placeholder="请输入商品价格"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input type="number" v-model="addForm.goods_weight" placeholder="请输入商品重量"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input type="number" v-model="addForm.goods_number" placeholder="请输入商品数量"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                v-model="addForm.goods_cat"
                                :options="catelist"
                                :props="cateProp"
                                @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb, index) in item.attr_vals" :key="index" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals" placeholder=""></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headersObj"
                            :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品按钮 -->
                        <el-button type="primary" class="addBtn" @click="addGoods">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览对话框 -->
        <el-dialog title="图片预览" :visible.sync="previewDialogVisible" width="50%" >
            <img :src="previewPath" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
// lodash包，做对象的深拷贝
import _ from 'lodash'

export default {
    data () {
        return {
            // 激活步骤条的索引
            activeIndex: 0,
            // 添加商品表单对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品分类数组
                goods_cat: [],
                // 图片上传的路径数组
                pics: [],
                // 商品详情描述
                goods_introduce: '',
                // 动态参数和静态属性
                attrs: []
            },
            // 校验规则
            addFormRules: {
                goods_name: [
                    { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price: [
                    { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight: [
                    { required: true, message: '请输入商品重量', trigger: 'blur' }
                ],
                goods_number: [
                    { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat: [
                    { required: true, message: '请选择商品分类', trigger: 'blur' }
                ]
            },
            // 商品分类列表
            catelist: [],
            // 级联选择器属性
            cateProp: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children',
                expandTrigger: 'hover'
            },
            // 动态参数列表
            manyTableData: [],
            // 静态属性列表
            onlyTableData: [],
            // 图片上传URL地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传请求头
            headersObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            // 图片预览地址
            previewPath: '',
            // 图片预览对话框显示控制
            previewDialogVisible: false
        }
    },
    created () {
        this.getCateList()
    },
    methods: {
        // 获取商品分类
        async getCateList () {
            const { data: res } = await this.$http.get('categories')
            if (res.meta.status !== 200) {
                return this.$msg.error('获取商品分类列表失败')
            }
            this.catelist = res.data
        },
        // 级联选择器发生变化时触发事件
        handleChange () {
            // 只允许选择三级分类
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
                return
            }
        },
        // 切换标签页事件
        beforeTabLeave (activeName, oldActiveName) {
            // 如果没有选择商品分类，不能切换标签
            if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$msg.error('请选择商品分类')
                return false
            }
        },
        // 点击tab页签事件
        async tabClick () {
            if (this.activeIndex === '1') { // 点击商品参数面板
                // 获取分类参数
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: {
                        sel: 'many'
                    }
                })
                if (res.meta.status !== 200) {
                    this.$msg.error('获取分类参数失败')
                }
                // 分隔动态参数可选项
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            } else if (this.activeIndex === '2') { // 点击静态属性面板
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: {
                        sel: 'only'
                    }
                })
                if (res.meta.status !== 200) {
                    this.$msg.error('获取静态属性失败')
                }
                this.onlyTableData = res.data
            }
        },
        // 图片预览处理
        handlePreview (file) {
            this.previewPath = file.response.data.url
            this.previewDialogVisible = true
        },
        // 图片删除处理
        handleRemove (file) {
            // 获取图片路径
            const filePath = file.response.data.tmp_path
            // 获取图片在数组中的索引
            var i = this.addForm.pics.findIndex(x => x.pic === filePath)
            // 从数组中删除该项
            this.addForm.pics.splice(i, 1)
        },
        // 图片上传成功时事件
        handleSuccess (resp) {
            // 拼接图片信息
            const picInfo = {
                pic: resp.data.tmp_path
            }
            // 添加到表单对象中
            this.addForm.pics.push(picInfo)
        },
        // 添加商品
        addGoods () {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return this.$msg.error('请填写必要的表单项')
                }
                // 添加商品
                // 表单对象深拷贝，防止goods_cat转换成功字符串时报错
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })
                // 静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                // 将动态参数和静态属性复制给form
                form.attrs = this.addForm.attrs
                // 发起请求
                const { data: res } = await this.$http.post('goods', form)
                if (res.meta.status !== 201) {
                    return this.$msg.error('添加商品失败')
                }
                this.$msg.success('添加商品成功')
                // 页面跳转
                this.$router.push('/goods')
            })
        }
    },
    computed: {
        cateId () {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox {
    margin: 0 10px 0 0 !important;
}
.previewImg {
    width: 100%;
}

.addBtn {
    margin-top: 15px;
}
</style>
